الأربعاء، 22 مايو، 2013

Electronic Draft Control ( EDC )

       التحكم الإلكترونى فى وظائف الجرار  بواسطة بروسيسور9                   Electronic Draft Control EDC 




Controlled by processor 9  Inputs from:
Operator
EDC control pod ( 8 )
EDC control panel ( 2 )
Linkage
Lift arm potentiometer ( 7 )
Load sensing pins ( 6 )
Radar ( for slip control only ) ( 1 )
Outputs
EDC valve ( 4 ) - controls CCLS pump via sensing lines and diverts pressure oil to lift cylinders.
Instrument cluster ( 3 ) - displays linkage height, slip %  and EDC errors.
Controls position of implement and / or regulates draft force on tractor by raising / lowering implement into / out of work

Control Panel
Drop rate control knob ( 1 ) - sets the speed of the implement lowering.
Height limit control ( 2 ) - sets the maximum height that the linkage will lift to.
Slip limit control  ( 3 ) - only available on units with radar - uses EDC system to raise implement when slip exceeds the value set by the knob.
Draft sensitivity knob ( 4 ) - Adjusts the level of tolerance of the EDC system before the linkage is adjusted when using draft control.
Control pod
Lift position control lever ( 6 )  - Sets lower limit for working depth.  Can be locked with adjustable stop
( 5 ).  If no draft load i.e. implement is out of the ground, the implement will be held at the position set by this lever ( see slide 6 ).
Draft loading wheel ( 7 ) - “0” on wheel = minimum draft  load  to “10” = maximum draft load.  This wheel sets the draft force for field operations ( see next 2 slides )
Fast raise / lower switch ( 8 ) - Used to raise or lower linkage mounted implement to the limits set by the lift arm position control lever and the height limit control knob.
Dynamic Ride Control
Allows EDC system to react to prevent implement bounce when travelling above 8kph
Turn drop rate knob fully anti-clockwise to transport lock position
Raise to maximum height using fast raise switch


1.Relief valve shim pack
2.Relief valve spring
3.Relief valve
4.Raise solenoid
5.Lower Solenoid
6.Sense line ‘Poppet’ check valve
7.Seal backup ring
8.O Ring seal
9.Valve body
10.Raise check / lock valve
1. Load check valve
2. Lift cylinder relief valve
3. Lowering metering valve
4. Lowering solenoid
5. Raise solenoid
6. Raise spool
7. Flow compensating valve
Disassembly
Pressure Relief Valve
Flow Control Valve
STRONG SPRINGS in both of these valves.  Take extreme care when removing end plugs.